PROPRIETARY SOFTWARE LICENSE — EUER-INVOICE

Copyright (c) 2026 Markus. All rights reserved in the original euer-invoice code.

1. Scope
This license applies to the original euer-invoice software and documentation.
Third-party software, fonts, schemas and validation rules are excluded and remain
under their respective licenses. See THIRD_PARTY_NOTICES.md and the legal/
directory distributed with the Java toolchain. Where terms conflict for a
third-party component, that component's own license takes precedence. Nothing
in this license restricts rights to use, copy, modify, redistribute or obtain
source code granted by a third-party license or mandatory applicable law.

2. Permitted use
You may install and use lawfully obtained, unmodified releases. The free features
and the monthly invoice-issuance allowance supplied with the release may be used
without purchasing a key. Use beyond that allowance requires a valid invoice or
combined product license. The invoice one-time purchase grants unlimited invoice
issuance for all invoice years without annual renewal. Combined Pro keys also
grant invoice issuance for all invoice years; their year lists apply only to DATEV
exports. A paid key grants the corresponding usage
rights; it does not transfer copyright or ownership.

You may make installation and backup copies. Unmodified official release packages
may be redistributed with this license and all third-party notices intact. This
permission allows distribution through PyPI, package mirrors and the Homebrew tap.
It does not permit redistribution of another person's commercial license keys.

3. Reserved rights
Except for the permissions above or a separate agreement with the copyright
holder, no permission is granted to modify, relicense or distribute modified
versions of the original proprietary euer-invoice code, or to bypass its license
enforcement. These restrictions do not apply to the excluded third-party
components or limit non-waivable statutory rights.

4. Third-party source code
The legal/ directory of the toolchain identifies third-party components and
provides the corresponding licensed sources and notices where required.
Third-party source code remains under the licenses stated there. No additional
fee or commercial euer-invoice key is required to exercise those rights.

5. Warranty and liability
To the extent permitted by applicable law, the software is provided "AS IS"
without warranties of merchantability, fitness for a particular purpose or
non-infringement. To the extent permitted by applicable law, the copyright holder
is not liable for losses arising from its use. Mandatory legal rights and
liabilities remain unaffected. Third-party authors provide their components under
their own disclaimers; any separate support agreement is offered by its provider
alone.
